/*******************************************************************************
 * Copyright 2010 DemandSpot
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/
package com.demandspot.hibernate.usertypes;

import java.io.Serializable;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Types;
import java.util.UUID;

import org.hibernate.HibernateException;
import org.hibernate.usertype.UserType;

@SuppressWarnings("unchecked")
public class UUIDUserType implements UserType {
	private static final int[] SQL_TYPES = {Types.VARCHAR};
	
	@Override
	public Object assemble(Serializable cached, Object owner) throws HibernateException {
		return cached;
	}

	@Override
	public Object deepCopy(Object value) throws HibernateException {
		return value;
	}

	@Override
	public Serializable disassemble(Object value) throws HibernateException {
		return (Serializable) value;
	}

	@Override
	public boolean equals(Object x, Object y) throws HibernateException {
		if (x != null && y != null) {
			return x.equals(y);
		}
		return false;
	}

	@Override
	public int hashCode(Object x) throws HibernateException {
		return x.hashCode();
	}

	@Override
	public boolean isMutable() {
		return false;
	}

	@Override
	public Object nullSafeGet(ResultSet rs, String[] names, Object owner) throws HibernateException, SQLException {
		String uuid = rs.getString(names[0]);
		UUID toReturn = null;
		
		if (!rs.wasNull()) {
			toReturn = UUID.fromString(uuid);
		}
		
		return toReturn;
	}

	@Override
	public void nullSafeSet(PreparedStatement st, Object value, int index) throws HibernateException, SQLException {
		if (value == null) {
			st.setNull(index, Types.VARCHAR);
		} else {
			st.setString(index, ((UUID)value).toString());
		}
	}

	@Override
	public Object replace(Object original, Object target, Object owner) throws HibernateException {
		return original;
	}

	@Override
	public Class returnedClass() {
		return UUID.class;
	}

	@Override
	public int[] sqlTypes() {
		return SQL_TYPES;
	}
}
